Permanently set threaded rods, studs, and rebar in dry concrete with these two-part epoxies. They form a weather-resistant chemical bond that seals out moisture and resists vibration and dynamic loads better than mechanical anchors. These have two parts that must be mixed. The size listed is the combined total of the two parts. Warning: Allowable pull-out strength is 25% of ultimate values or less, as required by building authorities.